NASCAR penalized the teams of Ty Dillon and Erik Jones for violating Section 14.6.5.E, regarding Rocker Box Assemblies in the NASCAR Rule Book.
The rule cited reads as follows: "The rocker box vent hole in the front tire extraction area must have metal screen installed to the inner surface with a minimum 0.25 inch opening size. The screen may be bonded or mechanically fastened to the internal surface of the rocker box."
